deriveRightBottomIdx 1581 source/common/cudata.cpp         uint32_t partIdxRB = deriveRightBottomIdx(puIdx);
deriveRightBottomIdx 1825 source/common/cudata.cpp         uint32_t partIdxRB = deriveRightBottomIdx(puIdx);
deriveRightBottomIdx  331 source/common/cudata.h     uint32_t deriveRightBottomIdx(uint32_t puIdx) const;